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        <h1>BootStrap</h1>
        <p>
            简洁、直观、强悍的前端开发框架，让Web开发更迅速、简单。
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            <button class="btn btn-primary">开始学习</button>
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    <h3>页头</h3>
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        <h1>BootStrap<small>简洁、直观、强悍的前端开发框架，让Web开发更迅速、简单。</small></h1>
    </div>
</div>
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